Which load type is considered the least stable and the least preferred?

The least stable and least preferred load type in sling loading operations is the low density load. This type of load is characterized by its light weight and often irregular shape, which makes it susceptible to being affected by environmental factors such as wind, turbulence, and rotor wash during flight.

Low density loads can shift in response to these forces, increasing the risk of instability and potentially creating hazardous conditions during the transport. As a result, they require more careful handling and attention when rigged for sling loading. The inherent instability of low density loads means they can move unpredictably, which complicates the pilot's ability to maintain control of the aircraft and can also pose a risk to personnel and equipment below.

In contrast, high density, dynamic, and aerodynamic loads generally possess more qualities that help maintain stability during flight due to their density, shape, and the way they interact with airflow. This makes them more favorable options when conducting sling load operations.